To represent the cost of a drink \( x \) using the information given, we can set up the equation based on the total cost of a slice of pizza and a drink:
\[ x + 3.19 = 5.61 \]
Now, we will solve for \( x \):
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Subtract 3.19 from both sides: \[ x = 5.61 - 3.19 \]
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Calculate the right side: \[ x = 2.42 \]
So the cost of a drink \( x \) is:
\[ x = 2.42 \]